ive been testing the last week
i found that you can vary the speed controller input signals ...we can control the output giving 33 rpm and 45rpm and 78 rpm....FROM A SINGLE PULLY SIZE...with a simple variable restistior (<---thats a volume knob control for the less tecs)

the new type floppys are what i have gone for ...simply coss they very easy to find

infact the old 5inch floppys are much better because they used bigger stronger motors...its the same wireing to make them work ...and slightly more ma to drive them ...so yes the 5 inch type are even more perfect....again every manufacter has made its own types ...so half the fun is opening the unit to see

these units are all negatively - triggered....
pins 12 and 16 are conected to the - of the battery pins 1-33 are all - as well....you cant do the unit any harm with a 4 or 5volt (mobile phone )battery...so dont be scared to try out things

the 12volt circuit is not needed in our use ...only the 5 volt side
12v (yellow) and 5v (red)...although a 12v battery could be used if you wanted with a drop down 5v regulator

i will have some time to photo my test unit with vary speed and wireing ill post tonight